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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of information and communication convergence engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 2, Issue 4 - Dec 2004
Volume 2, Issue 2 - Jun 2004
Volume 2, Issue 3 - Mar 2004
Volume 2, Issue 1 - Mar 2004
Selecting the target year
Performance Analysis of Multimedia CDMA Network with Concatenated Coding and RAKE Receiver
Roh Jae-Sung ; Kim Choon-Gil ; Cho Sung-Joon ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 139~144
In order to transmit various types of multimedia data (i.e. voice, video, and data) over a wireless channel, the coding and modulation scheme needs to be flexible and capable of providing a variable quality of service, data rates, and latency. In this paper, we study a mobile multimedia COMA network combined with the concatenated Reed-Solomon/Rate Compatible Punctured Convolution code (RS/RCPC). Also, this paper propose the combination of concatenated RS/RCPC coder and COMA RAKE receiver for multimedia COMA traffic which can be sent over wireless channels. From the results, using a frequency selective Rayleigh fading channel model, it is shown that concatenated RS/RCPC coder at the wireless physical layer can be effective in providing reliable wireless multimedia CDMA network. And the proposed scheme that combine concatenated RS/RCPC coder and CDMA RAKE receiver provides a significant gain in the BER performance over multi-user interference and multipath frequency selective fading channels.
New Evaluation on Maximum Ratio Diversity Reception for the Detection of Signals over Correlated Nakagami Fading Channels
Hong Wan-Pyo ; Kim Chang-Hwan ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 145~148
The performances of M-ary signals using L-branch maximum ratio combining (MRC) diversity reception in correlated Nakagami fading channels are derived theoretically. The coherent reception of M-ary differential phase shift keying (MDPSK), phase shift keying (MPSK), and quadrature amplitude modulation (MQAM) is considered. It is assumed that the fading parameters in each diversity branch are identical. The general formula for evaluating symbol error rate (SER) of M-ary signals in the independent branch diversity system is presented using the integral-form expressions.
Dependence of Resonance Characteristics on Thermal Annealing in ZnO-Based FBAR Devices
Mai Linh ; Yim Mun-Hyuk ; Yoon Gi-Wan ; Kim Dong-Hyun ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 149~152
In this paper, we present the film bulk acoustic resonator (FBAR) devices fabricated by considering the effects of annealing temperature on zinc oxide (ZnO) film growth characteristics. In order to determine the annealing temperature and annealing time at which the ZnO film can have good material properties, the several resonators containing ZnO layers were fabricated and annealed at various temperatures from
in Ar gas ambient. The effects of the annealing temperature and annealing time on the ZnO film properties were comprehensively studied in order to further improve the resonance characteristics of FBAR resonators.
Planar Active Rectrodirective Array With Subharmonic Phase Conjugation Mixers
Kim Gi-Rae ; Park Ji-Yong ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 153~156
A planar active retrodirective four-element array with subharmonic phase conjugation mixers based on anti-parallel diode pairs (APDPs) is proposed. As compared to previous phase conjugation mixers using twice RF frequency for LO frequency, the proposed conjugation mixers need only half RF frequency so that it can be easily applied for millimeter-wave applications. Receiving, transmitting, local oscillator, and intermediate frequencies are 5.79, 5.81, 2.9 GHz, and 10 MHz. Monostatic RCS and Bistatic RCS measurements at source locations of
show good agreement with the calculated data.
A Clinical History Recording Management Scheme on the Multimedia Telemedicine
Kim Seok-Soo ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 157~160
The paper's suggestion is about hereditary facts between family members. Diagnosing patients from the point of patients temporary conditions, and so performing primitive examinations and treatments, can lead not only to frequent wrong diagnoses, and to huge medical expenses and times to the patients, but even to critical situation of patients or taking lives away. As a means to cut these cases down to a minimum, sharing medical treatment information between family members is suggested. This approach makes possible understanding physical constitution and environment between family members, and can result in bringing a faster treatment effect if some family member suffers from a similar disease. This approach, since a participation in a family membership effectuates all of family members, can minimize the membership fees, thus enabling inter-family health care on a home doctor basis.
Matching Algorithm for Hangul Recognition Based on PDA
Kim Hyeong-Gyun ; Choi Gwang-Mi ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 161~166
Electronic Ink is a stored data in the form of the handwritten text or the script without converting it into ASCII by handwritten recognition on the pen-based computers and Personal Digital Assistants(PDA) for supporting natural and convenient data input. One of the most important issue is to search the electronic ink in order to use it. We proposed and implemented a script matching algorithm for the electronic ink. Proposed matching algorithm separated the input stroke into a set of primitive stroke using the curvature of the stroke curve. After determining the type of separated strokes, it produced a stroke feature vector. And then it calculated the distance between the stroke feature vector of input strokes and one of strokes in the database using the dynamic programming technique.
Medical Image Authentication over Public Communication Networks using Secret Watermark
Oh Keun-Tak ; Kim Young-Ho ; Lee Yun-Bae ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 167~171
The evolution of modern imaging modalities, followed by the rapid development of computer technology has introduced many new features in the communication networks used in medical facilities. Since it is very important to keep patient's record accurately, the ability to exchange medical data securely over the communication network is essential for any medical information. In this paper, therefore, we introduce some problems which occur from digitizing medical images such as MRI (Magnetic Resonance Imaging), CT (Computed Tomography), CR(Computed Radiography), etc., and then we propose a authentication mechanism for medical image verification using secret watermark images.
3D Graphics Library for Generating Real-time Special Effects
Kim Eung-Kon ; Yoo Bong-Kil ; Song Seung-Heon ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 172~176
In special effects industry there is a high demand to convincingly mimic the appearance and behavior of natural phenomena such as smoke, waterfall, rain, and fire. Particle systems are methods adequate for modeling fuzzy objects of natural phenomena. This paper presents particle system graphics library for generating special effects in video games and virtual reality applications. The library is a set of functions that allow c++ programs to simulate the dynamics of particles for special effects in interactive and non-interactive graphics applications, not for scientific simulation.
Iris Recognition using Multi-Resolution Frequency Analysis and Levenberg-Marquardt Back-Propagation
Jeong Yu-Jeong ; Choi Gwang-Mi ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 177~181
In this paper, we suggest an Iris recognition system with an excellent recognition rate and confidence as an alternative biometric recognition technique that solves the limit in an existing individual discrimination. For its implementation, we extracted coefficients feature values with the wavelet transformation mainly used in the signal processing, and we used neural network to see a recognition rate. However, Scale Conjugate Gradient of nonlinear optimum method mainly used in neural network is not suitable to solve the optimum problem for its slow velocity of convergence. So we intended to enhance the recognition rate by using Levenberg-Marquardt Back-propagation which supplements existing Scale Conjugate Gradient for an implementation of the iris recognition system. We improved convergence velocity, efficiency, and stability by changing properly the size according to both convergence rate of solution and variation rate of variable vector with the implementation of an applied algorithm.
Design On Secure Messenger Mechanism Using Elliptic Curve Cryptography and IPSec
Choi Gwang-Mi ; Park Su-Young ; Kim Hyeong-Gyun ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 182~186
When most of existing instant messengers log on server, they transmit to sever in encoding password to RC5. but RC5 don't be secured because it has been known many of password cracking tools. Also, messengers don't have any protection on the transmitted information with communicating two hosts since loging on, endangering the privacy of the user. As a counter measure, messengers need to provide security service including message encryption. In this paper, we designed a key exchange method of password representing fast, effective and high security degree, using ECC(Elliptic Curve Cryptography) that being known the very stronger than another public key cryptography with same key size. To effectively improve data transmission and its security using IPSec protocol between users, tunnel mode is introduced. Tunnel mode transmits Host-to-Host data through virtual pipelines on the Internet.
Non-linear distributed parameter system estimation using two dimension Haar functions
Park Joon-Hoon ; Sidhu T.S. ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 187~192
A method using two dimension Haar functions approximation for solving the problem of a partial differential equation and estimating the parameters of a non-linear distributed parameter system (DPS) is presented. The applications of orthogonal functions, including Haar functions, and their transforms have been given much attention in system control and communication engineering field since 1970's. The Haar functions set forms a complete set of orthogonal rectangular functions similar in several respects to the Walsh functions. The algorithm adopted in this paper is that of estimating the parameters of non-linear DPS by converting and transforming a partial differential equation into a simple algebraic equation. Two dimension Haar functions approximation method is introduced newly to represent and solve a partial differential equation. The proposed method is supported by numerical examples for demonstration the fast, convenient capabilities of the method.
Controller with Different Weighting Functions Using Convex Combination
Kim Min-Chan ; Park Seung-Kyu ; Kwak Gun-Pyong ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 193~197
In this paper, a combination problem of controllers which are the same type of
controllers designed with different weighting functions. This approach can remove the difficulty in the selection of the weighting functions. As a sub-controller, the Youla type of
controller is used. In the
controller, Youla parameterization is used to minimize
norm of mixed sensitivity function by using polynomial approach. Computer simulation results show the robustness improvement and the performance improvement.
Design of Optimal Controller Using Discrete Sliding Mode
Kim Min-Chan ; Ahn Ho-Kyun ; Kwak Gun-Pyong ; Nam Jing-Rak ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 198~201
In this paper, the discrete optimal control is made to have the robust property of Sliding mode controller. A augmented system with a virtual state is constructed for this objective and noble sliding surface is constructed based on this system. The sliding surface is the same as the optimal control trajectory in the original system. The states follow the optimal trajectory even if there exist uncertainties. The reaching phase problem of sliding mode control is disappear in this method.
The Four Points Diagonal Positioning Algorithm for Iris Position Tracking Improvement
Chai Duck-Hyun ; Ryu Kwang-Ryol ;
Journal of information and communication convergence engineering, volume 2, issue 3, 2004, Pages 202~204
An improvement of tracking capacity to find a position of the Iris images is presented in this paper. The propose algorithm is used the Four Points Diagonal Positioning algorithm that the image is positioned with arbitrary 4 points on the edge of iris and the selective 4 points are drawn by a diagonal line on the cross. The experiment result shows that the algorithm is efficient to track on the eyelid.